93 lines
2.2 KiB
TypeScript
93 lines
2.2 KiB
TypeScript
import { createContext, useContext, useEffect, useState } from 'react';
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export type Theme = 'dark' | 'light' | 'system';
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type ThemeProviderProps = {
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children: React.ReactNode;
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defaultTheme?: Theme;
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storageKey?: string;
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};
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type ThemeProviderState = {
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theme: Theme;
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setTheme: (theme: Theme) => void;
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};
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const initialState: ThemeProviderState = {
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theme: 'system',
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setTheme: () => null,
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};
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const ThemeContext = createContext<ThemeProviderState>(initialState);
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export function ThemeProvider({
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children,
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defaultTheme = 'system',
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storageKey = 'vite-ui-theme',
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}: ThemeProviderProps) {
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const [theme, setTheme] = useState<Theme>(
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() => (localStorage.getItem(storageKey) as Theme) || defaultTheme
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);
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useEffect(() => {
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const root = window.document.documentElement;
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root.classList.remove('light', 'dark');
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if (theme === 'system') {
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const systemTheme = window.matchMedia('(prefers-color-scheme: dark)')
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.matches
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? 'dark'
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: 'light';
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root.classList.add(systemTheme);
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return;
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}
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root.classList.add(theme);
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}, [theme]);
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// Listen for system changes when theme is 'system'
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useEffect(() => {
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if (theme !== 'system') return;
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const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
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const handleChange = () => {
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const root = window.document.documentElement;
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if (mediaQuery.matches) {
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root.classList.add('dark');
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root.classList.remove('light');
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} else {
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root.classList.add('light');
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root.classList.remove('dark');
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}
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};
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mediaQuery.addEventListener('change', handleChange);
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return () => mediaQuery.removeEventListener('change', handleChange);
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}, [theme]);
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const value = {
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theme,
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setTheme: (theme: Theme) => {
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localStorage.setItem(storageKey, theme);
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setTheme(theme);
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},
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};
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return (
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<ThemeContext.Provider value={value} {...{ value }}>
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{children}
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</ThemeContext.Provider>
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);
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}
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export const useTheme = () => {
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const context = useContext(ThemeContext);
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if (context === undefined)
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throw new Error('useTheme must be used within a ThemeProvider');
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return context;
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};
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